Also, it looks like some of the stamps on this rifle were modified/stamped out. There are two areas on the receiver. Both about the same size, and both in about the same location on each side of the receiver. At first, I though it may have been pitting, but the rest of the rifle has little to no pitting at all. It's just these two spots that are like this.

Here's the pics. I also wanted to learn a little about the history of this rifle, so I included all of the codes and stamps. Any ideas on what they mean? (I already know about the WaA63 Waffenampt and the S43)